runtime error

Exit code: 1. Reason: Traceback (most recent call last): File "/home/user/app/app.py", line 14, in <module> df_features = df[feature_cols].astype(float) ~~^^^^^^^^^^^^^^ File "/usr/local/lib/python3.12/site-packages/pandas/core/frame.py", line 4113, in __getitem__ indexer = self.columns._get_indexer_strict(key, "columns")[1] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.12/site-packages/pandas/core/indexes/base.py", line 6212, in _get_indexer_strict self._raise_if_missing(keyarr, indexer, axis_name) File "/usr/local/lib/python3.12/site-packages/pandas/core/indexes/base.py", line 6264, in _raise_if_missing raise KeyError(f"{not_found} not in index") KeyError: "['dB'] not in index"

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